Cylindrical Battery Cell Rotation Stopping via Meshed Grooves
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Solution Overview
Problem
Conventional rotation stopping mechanisms for cylindrical battery cells in battery assemblies are costly and inefficient, requiring additional components and increased assembly steps, which can lead to size constraints and higher manufacturing costs.
Innovation Solution
A battery assembly design featuring cylindrical battery cells with irregularities on their outer peripheral surfaces that mesh with corresponding groove portions in the holding member's installation holes, preventing rotation and eliminating the need for separate rotation stopping mechanisms in other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate dedicated jig is used to prevent battery rotation during assembly, then rotation stopping function is achieved, but the number of components and assembly steps increases
Solution Approach 1:
The rotation stopping function is merged into the holding member structure itself. The holding member includes protrusions that engage with grooves on the battery outer peripheral surface, eliminating the need for separate rotation stopping jigs or mechanisms. This integration reduces component count while maintaining the rotation prevention function.
2Reliability
If a separate dedicated jig is used to prevent battery rotation, then rotation stopping function is achieved, but assembly time and operating steps increase
Solution Approach 1:
The rotation stopping function is integrated into the holding member, allowing rotation prevention to occur automatically during the battery insertion process. This eliminates separate assembly steps for installing rotation stopping mechanisms, thereby improving assembly efficiency while maintaining reliable rotation prevention.
3Reliability
If rotation stopping mechanisms are provided on external terminals and accessories, then rotation stopping function is achieved, but the number of components and processing steps increase
Solution Approach 1:
The rotation stopping function is transferred from external terminals and accessories to the holding member structure. The holding member includes protrusions that engage with grooves on the battery, eliminating the need for rotation stopping mechanisms on multiple other components. This reduces the total number of components and simplifies manufacturing processes.
4Reliability
If a fixing mechanism using a dedicated jig is used, then rotation stopping function is achieved, but space for attaching the jig must be secured
Solution Approach 1:
The rotation stopping function is integrated into the holding member structure that already exists in the battery assembly. The protrusions and grooves for rotation prevention are formed within the existing holding member geometry, eliminating the need for additional space that would be required for separate rotation stopping jigs or mechanisms.
Data Source
AI summary
A battery assembly has circular cylindrical rechargeable/dischargeable battery cells (10) and a holding member for holding the battery cells. On the outer peripheral surface (32) of each battery cell are formed wavy irregularities (34) arranged in the circumferential direction of the battery cell and extending longitudinally. The holding member has battery cell installation holes each having grooves (28) formed in an inner peripheral surface (29) of the installation hole and engaging with the irregularities (34). The battery cells (10) are held inserted in the battery cell installation holes in the holding member, and in this state, the irregularities (34) on the outer peripheral surfaces (32) of the battery cells and the grooves (28) are fitted to each other.