Vehicle Battery Pack Structure for Rigidity Without Cell Space Loss
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Solution Overview
Problem
Existing battery packs face a challenge in maximizing the space for battery cells while ensuring sufficient structural rigidity to prevent damage from external impacts, often requiring numerous reinforcing members that reduce available space.
Innovation Solution
A battery pack structure that minimizes reinforcing members by using module fixing bolts, connection support bars, and support bolts to securely fasten and connect battery modules, while incorporating recessed end plates and internal members to enhance rigidity without obstructing module fixing bolts, allowing for efficient use of space and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plurality of reinforcing members are provided in the battery case to secure structural rigidity, then structural rigidity is improved, but the space available for mounting battery cells is reduced
Solution Approach 1:
The battery pack structure is divided into an upper case and a lower case, with battery modules arranged between them. The connection support bar segments the structure by connecting adjacent battery modules through the upper case, distributing structural reinforcement across multiple segments rather than requiring continuous reinforcing members throughout the entire battery case.
Solution Approach 2:
The upper case serves multiple functions: it acts as a structural reinforcement element, a mounting surface for support bolts, and a connector for the connection support bar. The connection support bar simultaneously connects adjacent battery modules and reinforces the overall structure, eliminating the need for separate reinforcing members.
2Quantity of substance
If the number of battery cells is increased to improve vehicle cruising range, then cruising range is improved, but structural rigidity may be compromised
Solution Approach 1:
Battery modules are segmented and arranged in rows between the upper and lower cases. The connection support bar further segments the structure by connecting adjacent modules, creating a modular framework that can accommodate increased numbers of battery cells while maintaining structural integrity through distributed connection points.
Solution Approach 2:
The connection support bar extends in the longitudinal direction of the battery pack, connecting battery modules that are adjacent to each other. This longitudinal dimension of reinforcement complements the vertical stacking of battery cells, providing structural rigidity without limiting the number of cells that can be accommodated in the available space.
Data Source
AI summary
A vehicle battery pack structure includes: a lower case, a plurality of battery modules accommodated in the lower case, an upper case coupled to an upper portion of the lower case and configured to cover a space accommodating the battery modules, and a plurality of module fixing bolts configured to penetrate end plates of the battery modules and fixed to the lower case. The vehicle battery pack structure further includes: a connection support bar disposed on upper sides of the end plates so as to connect the end plates of the battery modules adjacent to each other, and a plurality of support bolts configured to respectively penetrate the upper case and the connection support bar and fixed to the end plates.