Cylindrical Battery Assembly Fixing Plate Groove Engagement
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Solution Overview
Problem
Existing battery configurations with cylindrical cells face issues of displacement due to vibrations and poor connections between terminal electrodes and bus bars, leading to inefficient energy storage and potential operational failures.
Innovation Solution
The solution involves a cylindrical battery design with groove portions on the cells and an elastically deformable hook engagement system on a fixing plate, which secures cells in place and connects terminal electrodes to a flat bus bar with weld portions, preventing displacement and ensuring stable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cells are arranged in a plane with diameter direction, then energy storage capacity is improved, but cell displacement occurs due to vibrations
Solution Approach 1:
The fixing plate is divided into multiple fixing plate opening portions, each accommodating a specific cell. This segmentation allows independent positioning of each cell while maintaining overall structural integrity, preventing displacement during vehicle operation vibrations.
Solution Approach 2:
The cells are inserted into the fixing plate opening portions, creating a nested structure where cells are housed within designated spaces in the fixing plate. This nesting arrangement secures cells in place while maintaining the planar configuration for optimal energy storage capacity.
2Reliability
If multiple separate bus bars are used for adjacent terminal electrodes, then electrical connection is achieved, but assembly complexity increases
Solution Approach 1:
Multiple separate bus bars are merged into a single flat plate-shaped bus bar with multiple weld portions. This consolidation reduces the number of components from multiple separate bus bars to one integrated piece, significantly simplifying the assembly process while maintaining reliable electrical connections to all terminal electrodes.
Solution Approach 2:
The flat plate-shaped bus bar serves multiple functions simultaneously: it connects to multiple terminal electrodes through different weld portions, provides structural support, and ensures electrical continuity. This multi-functionality eliminates the need for multiple separate bus bars, reducing assembly complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses cell displacement during vehicle operation, enhances electrical connections, and simplifies the assembly process, leading to improved energy storage capacity and reliability.
Implementation Method 1
the engagement portion is an elastically deformable hook portion protruding from a face of the fixing plate
Implementation Method 2
a friction force can act between the hook portion and the groove portion to suppress the rotation of the cell around its axis
Implementation Method 3
each of the terminal electrodes of the plurality of cells being welded to a different one of the weld portions
Data Source
Figure 1
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AI summary
[PROBLEM] To suppress the displacement of a plurality of cells of cylindrical shape constituting an assembled battery. [SOLVING MEANS] An assembled battery including a plurality of cells of cylindrical shape arranged in a plane including a diameter direction, each of the cells including a groove portion extending in a circumferential direction, and a fixing plate including an engagement portion engaging with each of the groove portions of the cells to fix the plurality of cells. A bus bar electrically connecting terminal electrodes of adjacent two of the cells may be fixed to the fixing plate.