Battery Pack Lower Frame Block Structure for Weld Seam Strength
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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 structural strength and sealing performance.
Innovation Solution
A frame body design incorporating a first and second bracket with reinforcement portions received in mold chambers, connected by 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
1Strength
If lap joint and tailor welding are used to manufacture the lower housing, then the structural strength and sealing performance are improved, but stress concentration is easily formed at the welding seam causing failure risk
Solution Approach 1:
The lower housing is divided into multiple modular components (bottom plate, frame members, reinforcement structures) that can be manufactured separately and assembled together. This segmentation allows each component to be optimized independently, reducing stress concentration at joints while maintaining overall structural strength.
Solution Approach 2:
Reinforcement structures are pre-installed at critical welding seam locations before final assembly. These reinforcement structures are preliminarily positioned to distribute and bear stress, preventing stress concentration from forming at the welding seams during subsequent assembly and operation.
2Strength
If reinforcement structures are added to reduce stress concentration, then the connection strength and rigidity are improved, but the internal space of the battery pack is occupied
Solution Approach 1:
The reinforcement structures are designed to be nested within or integrated into the existing frame members and bottom plate structure. Rather than adding external reinforcement that would occupy internal space, the reinforcement elements are embedded within the structural framework, providing strength enhancement without compromising battery pack volume.
Solution Approach 2:
Reinforcement structures are strategically placed only at critical locations where stress concentration occurs (such as welding seams and connection points) rather than uniformly throughout the entire lower housing. This localized reinforcement approach provides necessary strength enhancement while minimizing the volume occupied by reinforcement elements.
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
The proposed frame body design increases the connection strength and rigidity of the battery pack while maintaining internal space utilization, effectively addressing stress concentration and sealing performance issues.
Implementation Method 1
the first outer top wall is welded to the second outer top wall
Data Source
Figure 1~3
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AI summary
The embodiments of the present application provide a frame body, a battery pack, and a device. The frame body is used for a battery pack and 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 is received in the first mold chamber, the second reinforcement portion is 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 the connecting portion of the first bracket and the second bracket, thereby improving the connection strength and rigidity of the frame body and also the overall bearing capacity of the lower housing including the frame body.