Battery Bolt Terminal Rotation Stopping Wall Design
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Solution Overview
Problem
The existing battery designs with electrode terminals on the top plate face challenges in maintaining the structural integrity of the rotation stopping wall due to the thinness required for a compact battery form factor, leading to potential cracking or breaking under tightening torque.
Innovation Solution
The battery design incorporates a rotation stopping wall with varying wall thicknesses at different abutting locations, where the wall thickness is thicker at the tightening location and thinner at the loosening location, and an enclosure wall with an inner peripheral shape that restricts bolt head rotation, preventing damage during nut loosening and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery width in the short direction is reduced to achieve a compact form factor, then the battery becomes thinner and more compact, but the wall thickness of the rotation stopping wall becomes too thin (approximately 1 millimeter), causing it to crack or break under tightening torque
Solution Approach 1:
The rotation stopping wall is designed with non-uniform wall thickness, featuring a first wall portion with greater thickness (second wall thickness) and a second wall portion with lesser thickness (first wall thickness). This local quality variation allows the wall to provide sufficient strength at critical locations while maintaining overall compact dimensions, resolving the contradiction between compact size and structural strength.
Solution Approach 2:
The rotation stopping wall employs an asymmetric thickness distribution rather than uniform thickness. The first wall portion has greater thickness to withstand tightening torque, while the second wall portion has lesser thickness to reduce overall volume. This asymmetric design optimizes the balance between strength requirements and compact form factor.
2Length of moving object
If the rotation stopping wall is made thinner to maintain compact battery dimensions, then the battery remains thin, but the wall may crack or break at the location where the bolt head abuts against it during tightening
Solution Approach 1:
The rotation stopping wall features localized thickness variation, with the first wall portion having greater thickness at the abutting location where the bolt head contacts during tightening. This local quality enhancement ensures reliability at the critical stress point while allowing other portions to be thinner for compact dimensions.
Solution Approach 2:
The design incorporates a thicker first wall portion in advance of the tightening operation, providing a cushioning effect that prevents cracking or breaking during the tightening process. This prior cushioning through increased thickness at the abutting location ensures the wall can withstand the applied torque without failure.
3Strength
If a uniform thick rotation stopping wall is used to prevent cracking, then the wall strength is sufficient, but the battery width in the short direction increases, making the battery less compact
Solution Approach 1:
Instead of using a uniformly thick rotation stopping wall, the design applies local quality by varying the wall thickness across different portions. The first wall portion has greater thickness for strength, while the second wall portion has lesser thickness to reduce volume, optimizing the balance between strength and compactness.
Solution Approach 2:
The rotation stopping wall is segmented into multiple portions with different thickness characteristics. The first wall portion and second wall portion are distinct segments with different thickness values, allowing each segment to fulfill its specific function while collectively achieving both strength and compactness.
4Reliability
If the wall thickness at the abutting location is increased to prevent cracking, then the rotation stopping wall reliability improves, but the overall battery dimensions increase
Solution Approach 1:
The rotation stopping wall implements local quality by concentrating increased thickness only at the first wall portion where the abutting location experiences stress during tightening. Other portions of the wall maintain lesser thickness, ensuring reliability at the critical location without increasing overall battery dimensions.
Solution Approach 2:
The wall is segmented into functional zones: the first wall portion with greater thickness for reliability at the abutting location, and the second wall portion with lesser thickness to minimize overall dimensions. This segmentation allows targeted strength enhancement without global dimension increase.
Data Source
AI summary
A battery includes: an insulating plate; a connecting terminal plate; a terminal bolt that passes through the connecting terminal plate, the bolt head being between the insulating plate and the connecting terminal plate, and having a regular N-sided polygon shape, the N being an even number; and a nut. The insulating plate includes a first rotation stopping wall near an end of the insulating plate; the first rotation stopping wall includes a first a first abutting location that abuts the bolt head being rotated in a tightening direction of the nut, and a second abutting location that abuts the bolt head being rotated in a loosening direction of the nut; and a distance from the first abutting location to the first end is greater than a distance from the second abutting location to the first end.