Battery Housing Fastening Structure Without Welded Side Flanges
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Solution Overview
Problem
The conventional method of welding fixing flanges to the side surfaces of a battery housing is difficult, leading to positioning issues and thermal distortion, which can cause deviations in the fastening portions with respect to the vehicle body frame, making it challenging to secure the housing appropriately.
Innovation Solution
A power storage device design that uses a vehicle body fastening member with a threaded portion, which is threadedly engaged with a bolt to fix the end plate to the housing part, eliminating the need for welding and allowing easy and reliable attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fixing flanges are welded to the side surfaces of the housing, then the housing can be fastened to the vehicle body, but thermal distortion occurs in the housing causing positioning deviations
Solution Approach 1:
The patent replaces the welding process (thermal-mechanical system) with a mechanical fastening system using bolts and threaded portions. This substitution eliminates thermal distortion while maintaining fastening strength, as the mechanical connection achieves secure attachment without heat input that causes housing deformation and positioning errors.
2Strength
If fixing flanges are welded to the side surfaces of the housing, then the housing can be fastened to the vehicle body, but the welding process is complicated and time-consuming
Solution Approach 1:
The patent segments the fastening system into separate components: the housing with integrated threaded portions, bolts, and fastening members. This segmentation allows for simplified assembly where components are independently positioned and connected, eliminating the complex sequential welding process and significantly improving assembly efficiency while maintaining fastening strength.
Solution Approach 2:
The threaded portions are preliminarily formed directly on the housing during housing manufacturing, before the fastening assembly takes place. This preliminary action eliminates the need for on-site welding operations, allowing for rapid assembly by simply threading bolts into the pre-formed portions, thereby greatly enhancing productivity.
3Strength
If fixing flanges are welded to the side surfaces of the housing, then the housing can be fastened to the vehicle body, but it is difficult to position the fixing flanges on the side surfaces
Solution Approach 1:
The patent merges the positioning and fastening functions into a single integrated system. The threaded portions are formed directly on the housing at the desired positions, combining the positioning reference and the fastening interface into one feature. This eliminates the separate positioning and attachment steps required by welding, making the manufacturing process much easier while ensuring accurate positioning and maintaining fastening strength.
Data Source
AI summary
A power storage device comprises: a cell group in which a plurality of battery cells are stacked; a cylindrical housing part that houses the cell group and has an opening at each end in a stacking direction of the battery cells; an end plate that covers the opening in the housing part; a vehicle body fastening member that is formed separately from the housing part and fastens the housing part to a vehicle body; and a bolt that fastens the end plate to the housing part, wherein the vehicle body fastening member has a threaded portion to be threadedly engaged with the bolt, and is fixed to the housing part by threadedly engaging the threaded portion with the bolt provided through the end plate and the housing part.