Battery Pack Case Structure for High-Rigidity Load Resistance
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Solution Overview
Problem
Existing battery packs face challenges in maintaining high rigidity when subjected to excessive loads due to abrupt acceleration, deceleration, or sharp turning, as they are not adequately designed to withstand such forces.
Innovation Solution
A battery pack design featuring a case body with integrated metal components, including a bottom portion, side portions, boss portions, and rib portions arranged in a lattice pattern, where the boss and rib portions are opposite each other with the side portion interposed, providing enhanced structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the battery case is fixed using cylindrical fixing portions, then the battery pack can be mounted on the vehicle body, but excessive loads from abrupt acceleration or sharp turning cause deformation and breakage due to insufficient rigidity
Solution Approach 1:
The case body is segmented into multiple functional portions: a bottom portion, side portions, boss portions for external fastening, and rib portions for internal reinforcement. This segmentation allows each portion to perform its specific function optimally while collectively achieving high rigidity without excessive overall complexity
Solution Approach 2:
The invention transitions from a simple shell structure to a three-dimensional reinforced structure by adding boss portions extending from the outer surface and rib portions extending into the internal space. These portions create a multi-dimensional framework that significantly enhances rigidity in multiple directions simultaneously
2Strength
If the case body is designed with high rigidity to withstand excessive loads, then deformation and breakage are prevented, but the size and weight of the case increase
Solution Approach 1:
Instead of uniformly thickening the entire case body, the invention applies reinforcement locally through boss portions at critical external fastening points and rib portions at critical internal structural points. This localized reinforcement achieves high rigidity where needed while minimizing additional weight throughout the entire case
Solution Approach 2:
The case body is formed as an integrated composite structure combining the bottom portion, side portions, boss portions, and rib portions into a unified rigid framework. This composite design optimizes the overall structural efficiency, achieving high strength-to-weight ratio by making each portion work synergistically
Data Source
AI summary
A battery pack includes a plurality of battery modules, and a case body forming a space where the plurality of battery modules are housed. The case body includes a bottom portion, a side portion erected from the bottom portion and surrounding the space, a boss portion joined to the side portion outside of the space and used to fasten the case body, and a rib portion extending between the plurality of battery modules adjacent to each other and joined to the side portion in the space. The boss portion and the rib portion are opposite to each other with the side portion interposed therebetween.