Cylindrical Battery Pack Cell Holder for Rotation Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packs with cylindrical secondary battery cells experience rotation within the cell holder, leading to potential defects such as detachment of spot welded parts or breakage of lead plates due to vibration, and adhesive fixation methods are time-consuming.
Innovation Solution
A battery pack design featuring a pair of side surface bodies with curved inner surfaces and an intermediate body that sandwiches cylindrical secondary battery cells, using fixing structures to prevent rotation, and optionally incorporating heat insulation and elastic materials to enhance stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to fix secondary battery cells to the cell holder, then rotation is suppressed, but assembly time increases significantly
Solution Approach 1:
The patent replaces the adhesive bonding method with a mechanical fixation system consisting of positioning protrusions on the cell holder that fit into corresponding recesses on the battery cells. This mechanical interlocking mechanism provides rotation suppression without requiring adhesive application, thereby reducing assembly time while maintaining reliability.
Solution Approach 2:
The positioning protrusions and recesses are designed to automatically align and lock the battery cells in the correct orientation during assembly. The mechanical structure itself provides the fixation function without requiring additional adhesive application steps, making the system self-sufficient for rotation suppression.
2Productivity
If no fixation method is used, then assembly is simple and fast, but rotation occurs under vibration leading to defects
Solution Approach 1:
The cell holder is segmented with multiple positioning protrusions distributed at different locations to contact corresponding recesses on each battery cell. This segmentation allows for simple, localized mechanical features that provide effective rotation suppression without complex overall structure, maintaining both assembly speed and reliability.
Data Source
AI summary
A battery pack includes: a plurality of secondary battery cells each having a cylindrical shape, the plurality of secondary battery cells being arranged adjacent to each other to be parallel to each other; an intermediate body arranged between adjacent secondary battery cells among the plurality of secondary battery cells; and a pair of side surface bodies each of which includes an inner surface formed in a curved shape according to an outer shape of the secondary battery cell and sandwiches a corresponding one of the plurality of secondary battery cells between a part of the inner surface and a part of a surface of the intermediate body. The part of the surface of the intermediate body includes a curved region curved in a shape along a side surface of the corresponding one of the plurality of secondary battery cells.