Battery Pack Frame Body Reinforcement for Stronger Welded Joints
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Solution Overview
Problem
The existing battery pack lower housing structures face stress concentration issues at welding seams due to lap joints and tailor welding, leading to potential failure and inadequate strength and sealing performance.
Innovation Solution
A frame body design incorporating a first and second bracket with mold chambers and reinforcement portions, connected via a block to enhance connection strength and rigidity, reducing stress concentration and improving sealing performance without occupying internal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lap joint or tailor welding is used to manufacture each part of the lower housing, then the structural assembly is achieved, but stress concentration is easily formed at the welding seam causing failure risk
Solution Approach 1:
The lower housing is divided into multiple modular parts (bottom plate, side frames, end frames) that can be manufactured separately and then assembled together, allowing each component to be optimized independently while reducing overall stress concentration points
Solution Approach 2:
The block is designed to integrate multiple reinforcement portions (first reinforcement portion, second reinforcement portion, third reinforcement portion) into a single unified structure that connects multiple brackets, distributing stress across the entire assembly rather than concentrating it at individual welding seams
2Strength
If reinforcement structures are added to enhance connection strength, then the structural rigidity is improved, but the internal space of the battery pack is reduced
Solution Approach 1:
The reinforcement portions are strategically positioned within the structural framework of the lower housing itself, nesting the reinforcement function within the existing structural geometry rather than adding external bulk that would encroach on internal battery space
Solution Approach 2:
The reinforcement structure utilizes the vertical and lateral dimensions of the bracket connections efficiently, creating strength through three-dimensional geometric optimization rather than simply adding mass in the horizontal plane, thereby preserving internal volume
Data Source
AI summary
The embodiments of the present application provide a frame body, a battery pack, and a device. The frame body used for a battery pack includes a first bracket comprising a first mold chamber; a second bracket connected end to end with the first bracket to form a receiving cavity, the second bracket comprising a second mold chamber; and a block comprising a first reinforcement portion and a second reinforcement portion, wherein the first reinforcement portion received in the first mold chamber and the second reinforcement portion received in the second mold chamber, and the block is adapted to connect the first bracket with the second bracket. The frame body is provided with a block at a connecting portion of the first bracket and the second bracket, thereby improving a connection strength and rigidity of the frame body and the overall bearing capacity of the lower housing including the frame body.