Battery Stack Bind Bar Fixation With Stopper Wall
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Solution Overview
Problem
In power supply devices with vertically divided bind bars, preventing rotation of bent pieces fixed with a single bolt is challenging, leading to potential lateral displacement of battery cells and increased component and manufacturing costs due to the need for multiple bolts.
Innovation Solution
A power supply device design featuring a stopper wall on the end plate to prevent rotation of bent pieces fixed with a single bolt, reducing the number of bolts required and ensuring stable fixation of the bind bar, thereby preventing lateral displacement of battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bent piece is fixed to the end plate with a single bolt, then the number of bolts is reduced and manufacturing cost is decreased, but the bent piece may rotate leading to displacement of the bind bar
Solution Approach 1:
A stopper piece is introduced as an intermediary component between the bent piece and the end plate. The stopper piece prevents rotation of the bent piece by abutting against its outer peripheral edge, while the single bolt secures the bent piece to the end plate through the stopper piece, thereby maintaining fixation stability with reduced bolt quantity
Solution Approach 2:
The stopper piece is configured with a through-hole that replicates the bolt insertion path, allowing the bolt to pass through both the stopper piece and the bent piece. This copying of the fastening function enables the stopper piece to serve dual purposes: preventing rotation and facilitating bolt attachment
2Reliability
If multiple bolts are used to fix the bent piece, then rotation prevention is improved, but component cost and manufacturing complexity increase
Solution Approach 1:
The stopper piece serves as a mediator that provides rotation prevention functionality without requiring multiple bolts. By positioning the stopper piece such that its surface abuts the outer peripheral edge of the bent piece, it restricts rotational movement while the single bolt maintains the assembly together through the stopper piece
3Adaptability or versatility
If the bind bar is vertically divided into two parts, then adaptability to different battery stack configurations is improved, but the complexity of fixing the bind bar increases
Solution Approach 1:
The bind bar is divided into two separate vertical parts, each with its own bent piece at the end portions. This segmentation allows the bind bar to adapt to different battery stack configurations and widths, while the standardized stopper piece and single-bolt fixation method keeps the overall complexity manageable
Solution Approach 2:
The stopper piece is designed as a universal component that can be used with both vertically divided bind bar configurations. The through-hole design and abutting surface configuration allow the same stopper piece to prevent rotation regardless of which vertical section of the bind bar is being fixed, providing multi-functional applicability
Data Source
AI summary
A power supply device has a structure in which a bind bar having bent pieces at both ends coupled to end plates disposed at both end portions of a battery stack is divided in a width direction of a side surface of the battery stack, the bent piece of each bind bar is bolted to an outer surface of one of the end plates, the one of the end plates is provided with a stopper wall that prevents rotation of a bent piece fixed with a single bolt, which is fixed to the one of the end plates via one bolt, and the bent piece is fitted to a stopper wall to prevent the displacement of the bind bar.